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lavfi: add missing check in avfilter_filter_samples()

Avoid out-of-buffer data access when nb_channels is 8.

Stefano Sabatini authored on 2011/12/27 23:15:02
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@@ -678,7 +678,7 @@ void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
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         link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
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         /* Copy actual data into new samples buffer */
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-        for (i = 0; samplesref->data[i]; i++)
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+        for (i = 0; samplesref->data[i] && i < 8; i++)
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             memcpy(link->cur_buf->data[i], samplesref->data[i], samplesref->linesize[0]);
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         avfilter_unref_buffer(samplesref);